I was talking to a friend of mine over the holidays who installs for a large telco. His platform includes several Cisco IADs that are currently in service and mostly the IAD2430 series. From his install and working position, the IAD works great.
The popularity of VOIP telephone installs has soared over the last chunk of years, so installs of IADs have obviously been on the rise too.
Cisco IADs take several channels of data, voice, or fax traffic from a user and mashes them into one stream over a single or multiple WAN uplink. Most applications that love this are